CN113794521B - Underwater acoustic communicator awakening method based on multi-tone signal - Google Patents
Underwater acoustic communicator awakening method based on multi-tone signal Download PDFInfo
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04B11/00—Transmission systems employing sonic, ultrasonic or infrasonic waves
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B13/00—Transmission systems characterised by the medium used for transmission, not provided for in groups H04B3/00 - H04B11/00
- H04B13/02—Transmission systems in which the medium consists of the earth or a large mass of water thereon, e.g. earth telegraphy
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/309—Measuring or estimating channel quality parameters
- H04B17/336—Signal-to-interference ratio [SIR] or carrier-to-interference ratio [CIR]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0036—Systems modifying transmission characteristics according to link quality, e.g. power backoff arrangements specific to the receiver
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Abstract
The invention discloses an underwater acoustic communicator awakening method based on multi-tone signals, and belongs to the technical field of underwater acoustic communication. The method comprises the steps of signal transmission, signal reception, awakening signal capture and the like. The method is used for remotely waking up the underwater acoustic communicator, has lower algorithm complexity, can effectively improve the success rate of capturing the wake-up signal of the underwater acoustic communicator, can realize that the wake-up signal carries prior information by setting single tone signals with different frequencies, and improves the subsequent information demodulation and decoding processing speed of the underwater acoustic communicator; meanwhile, by setting the false alarm detection frequency, the false alarm caused by the broadband interference signal to the underwater acoustic communication machine can be effectively resisted.
Description
Technical Field
The invention relates to the technical field of underwater acoustic communication, in particular to an underwater acoustic communicator awakening method based on multi-tone signals.
Background
With the increase of the strategic position of the ocean, the technology for acquiring and processing relevant ocean information attracts more and more attention, and researchers are increasingly interested in the development of ocean resources and the research of underwater communication technology. Ocean data is a key basis for enriching ocean technology application scenes, and comprises the steps of data generation, acquisition, storage, transmission and processing, and underwater acoustic communication is used as an effective means for carrying out underwater remote data transmission and becomes a key research topic of each ocean nation. The underwater acoustic communication technology with low cost, high energy efficiency, safety and reliability is designed and developed, and plays a very important role in national defense and national economic construction.
Unlike wired or wireless transmission on land, unreliable underwater acoustic channels and complex underwater acoustic environments present many obstacles to the design and research of underwater acoustic communicators. The underwater acoustic channel has the following basic characteristics: the transmission speed of sound waves in water is about 1500 m/s; when sound waves are transmitted in the sea, the received signals are easily distorted due to multipath effects caused by refraction and sea bottom and sea surface reflection; the transmission delay between the underwater acoustic communicators is a binary function of time and space. Because the underwater acoustic communication machine usually adopts a low-power consumption processing platform and has limited computing capability, the computing power of an underwater acoustic channel needs to be considered when designing the awakening method suitable for the underwater acoustic communication machine, and the requirement on clock synchronization between the nodes of the underwater acoustic communication machine is avoided.
The awakening method is the key for the underwater acoustic communication machine to realize the communication function, and only by accurately capturing the awakening signal, the underwater acoustic communication machine can be ensured to receive the complete communication signal, so that necessary conditions are provided for subsequent demodulation and decoding. Therefore, in order to ensure the reliability of the underwater acoustic communication device, a wake-up method suitable for the underwater acoustic communication device needs to be designed and proposed.
Disclosure of Invention
In view of the above, the present invention provides a method for waking up an underwater acoustic communication device based on multiple single-tone signals, which solves the problem of high computational complexity of the underwater acoustic communication device wake-up technology, and effectively reduces the false alarm probability of the wake-up signal.
In order to achieve the purpose, the invention adopts the technical scheme that:
a multi-tone signal-based underwater acoustic communicator awakening method is used for communication awakening between underwater acoustic communicators and comprises the following steps:
(1) the underwater acoustic communication machine A serving as a transmitting node receives data to be transmitted of an upper computer through a data interface;
(2) adding a multi-tone wake-up signal to the head of a communication signal by the underwater acoustic communicator A; if the communication frequency band of the underwater acoustic communication machine A is [ f ]L，fH]Then, a tone signal s is set1Has a frequency of f1＝fHAnd sets a tone signal s3Has a frequency of f3＝fLThe signal length is l; further, a single tone signal s is set2Frequency f of2，fL<f2<fHAnd f is2≠falarm，falarmDetecting frequency, single tone signals s for false alarms2Used for carrying modulation mode and data length information;
(3) the underwater acoustic communicator A carries out digital-to-analog conversion and power amplification on the complete underwater acoustic communication signal added with the multi-tone wake-up signal, and then transmits the complete underwater acoustic communication signal to an underwater acoustic communicator B serving as a receiving node;
(4) the underwater acoustic communication machine B receives the signal sent by the underwater acoustic communication machine A and obtains a digital signal through analog-to-digital conversion;
(5) the underwater acoustic communication machine B packs the digital signals into data packets with the length of l according to the sequence to obtain received signals;
(6) the underwater acoustic communicator B detects a multi-tone wake-up signal from a received signal in a sliding window mode, wherein the length of a detection window is 2 x l and is consistent with 2 times of the length of a single-tone signal, and the single-sliding length is l;
(7) performing N-point fast Fourier transform on a signal in a detection window to obtain a frequency spectrum, and calculating a power spectrum of the frequency spectrum;
(8) according to the sampling frequency f of the underwater acoustic communicator BsAnd the number N of points of fast Fourier transform to obtain the frequency resolution fres＝fs/N；
(9) According to frequency resolution fresCalculating f1、f2、f3、falarmCorresponding spectral line position: loci＝fi/fres(ii) a The subscript i represents 1, 2, 3, alarm, lociDenotes f1、f2、f3、falarmThe corresponding spectral line position;
(10) setting a frequency deviation tolerance f according to the maximum Doppler frequency deviation possibly occurring in the underwater acoustic communication processoffsetCalculating the frequency point of each single-tone signal on the basis of the power spectrum, and calculating each frequency at [ f [ ]i-foffset，fi+foffset]In-band average power p within a rangeiWhile calculating the average power p of the out-of-band noise of the single tone signali-offsetThe frequency range of the out-of-band noise is [ f ]i-2*foffset，fi-foffset)∪(fi+foffset+2*foffset]；
(11) According to in-band average power piAnd out-of-band average power pi-offsetCalculating SNRi＝10*log(pi/pi-offset)；
(12) If the SNR of multiple tone signalsiAre all larger than a preset detection threshold SNRgateAnd has SNRalarm<SNRgateJudging that the acquisition of the wake-up signal is finished;
(13) and according to the detected value of the f2 frequency point, acquiring the modulation mode and data length information carried by the wake-up signal, and providing prior information for the demodulation and decoding of subsequent communication signals.
The invention has the beneficial effects that:
1. the method realizes the remote awakening of the underwater acoustic communication machine, can complete the capture of the awakening signal only by one-time Fast Fourier Transform (FFT), and has lower algorithm complexity.
2. The invention can effectively improve the success rate of capturing the wake-up signal by the underwater acoustic communicator, and meanwhile, the specific single tone signal is set, so that the wake-up signal can carry prior information, and the processing speed of demodulation and decoding of the underwater acoustic communicator is improved.
Drawings
FIG. 1 is a flow chart of a method according to an embodiment of the present invention.
Fig. 2 is a diagram of a multi-tone wake-up signal according to an embodiment of the invention.
Fig. 3 is a schematic diagram of the multi-tone signal carrying the prior information according to the embodiment of the present invention.
Fig. 4 is a schematic diagram of a process of detecting a wake-up signal by a sliding window in an embodiment of the present invention.
Detailed Description
As shown in fig. 1, a method for waking up an underwater acoustic communicator based on multi-tone signals includes the following steps:
(1) initialization
1) The communication energy converters of the transmitting node and the receiving node of the underwater acoustic communication machine enter water, power-up and self-detection are respectively completed, and the self-detection state of each board card is confirmed to be normal;
2) the underwater acoustic communicator serving as the transmitting node completes interface test with the upper computer, and the data interface comprises but is not limited to a serial port (RS232/422/485) and a network port (RJ45) to ensure that data sent by the upper computer can be correctly received.
(2) Signal transmission
1) The underwater acoustic communication machine serving as the transmitting node receives data to be transmitted of the upper computer through the data interface;
2) the transmitting underwater acoustic communicator adds a multi-tone wake-up signal to the head of the communication signal, as shown in fig. 2;
3) if the communication frequency band of the underwater acoustic communication machine is fL，fH]Setting a monophonic signal s1、s3Frequency of (d): f. of1＝fH，f3＝fLThe signal length is l;
4) single tone signal s2For carrying information, according to the modulation pattern, where only s is specified2Without limiting the specific frequency, i.e. fL<f2<fHFurthermore f2Should be set to avoid false alarm detection frequencies, i.e. f2≠falarmAs shown in fig. 3;
5) the underwater acoustic communication machine pushes the generated complete underwater acoustic communication signal to a power amplifier through a digital-analog conversion unit, and the power amplifier drives an underwater acoustic communication transducer to transmit the signal.
(3) Signal reception
1) An underwater acoustic communicator serving as a receiving node acquires acoustic signals in an underwater acoustic channel through an underwater acoustic communication transducer, and converts analog signals into digital signals through an analog-digital conversion unit;
2) and the digital signals are sequentially packed into data packets with the length of l and uploaded to a signal processing unit of the water receiving general machine.
(4) Wake-up signal acquisition
1) Detecting a multi-tone wake-up signal by adopting a sliding window mode aiming at a digital signal collected by a water traffic machine, wherein the length of a detection window is 2 x l and is consistent with 2 times of the length of a single-tone signal, the length of a single sliding is l, and the sliding process of the detection window is shown in figure 4;
2) performing N-point Fast Fourier Transform (FFT) on the signal in the detection window to obtain a frequency spectrum, and calculating a power spectrum of the frequency spectrum;
3) according to the sampling frequency, f, of the underwater acoustic communicatorsAnd FFT point number N to obtain frequency resolution fres＝fs/N；
4) According to frequency resolution fresCalculating f1、f2、f3、falarmCorresponding line position, loci＝fi/fres；
5) Setting a frequency deviation tolerance f according to the maximum Doppler frequency deviation possibly occurring in the underwater acoustic communication processoffsetCalculating the frequency point of each single-tone signal on the basis of the power spectrum, wherein the frequency point is calculated to be at [ f [ ]i-foffset，fi+foffset]Average power p in the rangeiSimultaneously calculating the average power p of the out-of-band noise of the single tone signali-offsetThe frequency range of the out-of-band noise is [ f ]i-2*foffset，fi-foffset)∪(fi+foffset+2*foffset]；
6) According to in-band average power piAnd out-of-band average power pi-offsetCalculating the SNRi＝10*log(pi/pi-offset)；
7) If the SNR of multiple tone signalsiAre all larger than a preset detection threshold SNRgateAnd has SNRalarm<SNRgateJudging that the acquisition of the wake-up signal is finished;
8) based on the final detected f2The specific value of the frequency point can obtain the modulation mode and data length information carried by the wake-up signal, and provide prior information for the demodulation and decoding of subsequent communication signals.
In a word, the method realizes the awakening of the underwater acoustic communication machine based on the multi-single-tone signal, can finish the detection and the capture of the awakening signal by only calculating the FFT once, greatly reduces the detection complexity of the awakening signal, and is more suitable for the operation environment of the underwater acoustic communication machine with limited computing power and energy. In addition, through setting up the single tone signal and the false alarm frequency of different frequencies, not only realized carrying prior information in the awakening signal, also can effectively resist the false alarm that broadband interference signal brought for the water traffic machine simultaneously.
Claims (1)
1. A multi-tone signal based underwater acoustic communicator awakening method is used for communication awakening between underwater acoustic communicators and comprises the following steps:
(1) the underwater acoustic communication machine A serving as a transmitting node receives data to be transmitted of an upper computer through a data interface;
(2) adding a multi-tone wake-up signal to the head of a communication signal by the underwater acoustic communicator A; if the communication frequency band of the underwater acoustic communication machine A is [ f ]L，fH]Then, a tone signal s is set1Has a frequency of f1＝fHAnd sets a tone signal s3Has a frequency of f3＝fLThe signal length is l; further, a single tone signal s is set2Frequency f of2，fL<f2<fHAnd f is2≠falarm，falarmDetecting frequency, single tone signals s for false alarms2Used for carrying modulation mode and data length information;
(3) the underwater acoustic communicator A performs digital-to-analog conversion and power amplification on the complete underwater acoustic communication signal added with the multi-tone wake-up signal, and then transmits the signal to an underwater acoustic communicator B serving as a receiving node;
(4) the underwater acoustic communication machine B receives the signal sent by the underwater acoustic communication machine A and obtains a digital signal through analog-to-digital conversion;
(5) the underwater acoustic communication machine B packs the digital signals into data packets with the length of l according to the sequence to obtain received signals;
(6) the underwater acoustic communicator B detects a multi-tone wake-up signal from a received signal in a sliding window mode, wherein the length of a detection window is 2 x l and is consistent with 2 times of the length of a single-tone signal, and the single-sliding length is l;
(7) performing N-point fast Fourier transform on a signal in a detection window to obtain a frequency spectrum, and calculating a power spectrum of the frequency spectrum;
(8) according to sampling frequency f of underwater acoustic communicator BsAnd the number N of points of fast Fourier transform to obtain the frequency resolution fres＝fs/N；
(9) According to frequency resolution fresCalculating f1、f2、f3、falarmCorresponding spectral line position: loci＝fi/fres(ii) a The subscript i represents 1, 2, 3, alarm, lociDenotes f1、f2、f3、falarmThe corresponding spectral line position;
(10) setting a frequency deviation tolerance f according to the maximum Doppler frequency deviation possibly occurring in the underwater acoustic communication processoffsetCalculating the frequency point of each single tone signal on the basis of the power spectrum, and calculating the frequency at fi-foffset，fi+foffset]In-band average power p within a rangeiSimultaneously calculating the average power p of the out-of-band noise of the single tone signali-offsetThe frequency range of the out-of-band noise is fi-2*foffset，fi-foffset)∪(fi+foffset+2*foffset]；
(11) According to in-band average power piAnd out-of-band average power pi-offsetCalculating SNRi＝10*log(pi/pi-offset)；
(12) If the SNR of multiple tone signalsiAre all larger than a preset detection threshold SNRgateAnd has SNRalarm<SNRgateIf yes, determining that the acquisition of the wake-up signal is finished;
(13) based on detected f2And obtaining the modulation mode and data length information carried by the wake-up signal by the value of the frequency point, and providing prior information for the demodulation and decoding of subsequent communication signals.
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| CN112422198A (en) * | 2020-11-11 | 2021-02-26 | 深圳市智慧海洋科技有限公司 | Wake-up circuit, method and underwater acoustic communication machine |
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